TM 5-3895-374-24-1Chapter 9TroubleshootingTips for Troubleshooting YourWhen troubleshooting, pay careful attention to these general warningsControl SystemATTENTION: Have all personnel remain clear of the controllerand equipment when power is applied The problem may beintermittent and sudden unexpected machine motor could resultm injury Have someone ready to operate an emergency-stopswitch in case it becomes necessary to shut off power to thecontroller equipment. Also, see NFPA 70E Part II for additionalguidelines for safety related work practices.Never reach into a machine to actuate a switch since unexpectedmachine motion can occur and cause injury.Remove all electrical power at the main power disconnectswitches before checking electrical connections or inputs/outputscausing machine motion.If installation and start-up procedures detailed in chapters 5, 6, and 7 were followedclosely, your SLC controller will give you reliable service If a problem should occur, thefirst step in the troubleshooting procedure is to identify the problem and its source.The SLC 500 controller has been designed to simplify troubleshooting procedures Byobserving the diagnostic indicators on the front of the power supply, processor unit andI/O modules, the majority of faults can be located and corrected These indicators, alongwith error codes Identified in the programming device user manual and programmer’smonitor, help trace the source of the fault to the user’s input/output devices, wiring, or thecontroller.Removing PowerBefore working on a SLC 500 modular system, always remove the power supply inputpower at the main power disconnect switch.The power LED on the power supply indicates that DC power Is being supplied to thechassis. The LED could be off when incoming power is present.(page 3-435)
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